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Scfvs in photosynthetic microbes

Inactive Publication Date: 2007-06-28
THE HONG KONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] The present invention provides prokaryotic and eukaryotic algae that produce single-chain antibodies for the treatment of aquaculture pathogens. Additionally, heterotrophic algae may be us

Problems solved by technology

Aquaculture species, such as prawn, abalone or the like, are susceptible to bacterial, viral and parasitic diseases.
In dense culture situations used for aquaculture, infections often transmit rapidly, inflict massive mortality, and cause large economic losses.
If there is a disease outbreak, the pathogen may persist for a long time despite attempts to remove them by expensive pond drying, sun exposure, and installation of water treatment systems.
Aquaculture pathogens are not only dangerous to the aquaculture species, some pathogens, such as Vibrio cholerae, can also cause diseases in humans.
Antibiotics and / or chemical treatments have been used to control pathogens, but these are not effective for all types of pathogens.
Chemical treatments cannot differentiate pathogens from benign species and can be detrimental to the aquaculture species.
The removal of benign probiotic species often makes the aquaculture species more susceptible to subsequent infections.
Unfortunately, the immune response of aquaculture species are not well documented, and field data clearly show immunization is inadequate for aquaculture conditions.
Immune response, even in farm animals, is not rapid enough to prevent disease outbreak, especially with high density populations.
The logistics of immunization in aquaculture species are also prohibitive.
Thus, traditional immunization in aquaculture species is not practical.
Although theoretically plausible, this method would not be practical.
Production using traditional techniques could not be economically increased to the scale required for aquaculture pathogen treatment.
Penaeid shrimp are particularly vulnerable.
Thus WSSV is extremely lethal and damages or destroys all systems of the infected aquaculture.
Aquaculture pathogens can be extremely lethal, spread rapidly, and are damaging to aquacultures worldwide.

Method used

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  • Scfvs in photosynthetic microbes
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  • Scfvs in photosynthetic microbes

Examples

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example 1

Materials and Methods

[0052] PCR was performed using AMPLITAQ® Gold DNA polymerase kit (APPLIED BIOSYSTEMS™, CA, USA) and a MASTERCYCLER® Gradient thermal cycler (EPPENDORF™, Hamburg, Germany). The PCR reaction was carried out in 100 μl of solution containing 10 μl Roche 10×PCR buffer II, 1 mM MgCl2, 100 μM dNTP, 0.25 μM each primer, 10 ng genomic DNA as template, and 5 U polymerase. The PCR amplification cycles consisted of denaturation at 94° C. for 45 sec (1 cycle), followed by 29 cycles of 94° C. 45 sec, 53° C. 45 sec and 72° C. 45 sec, the last extension was at 72° C. for 5 min. PCR products are resolved on 1.5% agarose gel stained with ethidium bromide and purified using CONCERT™ PCR purification kit (LIFETECHNOLOGIES™).

[0053] The recombinant DNA cassette illustrated in FIG. 4 was constructed by assembling within the coding region for rjbJ (SEQ ID NO: 7), the promoter region of Synechocystis PCC 6803 psbA II (SEQ ID NO: 10), a kanamycin resistance gene (KmR). The rjbJ coding ...

example 2

Expression of FcSv in Chlamydomonas

[0056]C. reinhardtii 950FcSv was generated by introducing a recombinant DNA cassette (FIG. 10) into the wild type C. reinhardtii. The box filled with crosshatch represents the coding sequence for ScFv with codons optimized for expression in C. reinhardtii, Ble is the bacterial bleomycin resistance gene serving as a dominant selectable marker (Stevens et al. 1996), Pro is the promoter region of RbcS2 in C. reinhardtii(Goldschmidt-Clermont and Rahire. 1986), Ω is the 5′untranslated leader (omega sequence) of tobacco mosaic virus (Schmitz et al. 1996), I is the first intron of RbcS2 (Lumbreras et al. 1998), C+K represent the ER retention sequence KDEL (SEQ ID NO: 14; Napier et al. 1992), T is the terminator of RbcS2 gene of C. reinhardtii. The coding sequence for ScFv was inserted using the NcoI site and NotI site.

[0057] In another embodiment, the present invention provides the details for the construction of a recombinant DNA molecule cassette for ...

example 3

Expression of ScFv-DB3 in Synechocystis

[0058] To investigate the production of ScFvs in cyanobacteria, the coding region for progesterone binding ScFvs DB3 was generated, incorporated into Synechocystis PCC 6803, and expressed in culture. Results indicate that functional DB3 was expressed in Synechocystis 6803 ScFvs DB3 and has a very high specificity for progesterone.

Synthesis of ScFvs DB3 Coding Sequence

[0059] An expression cassette for ScFvs DB3 in Synechocystis was designed which incorporated a 3′ flanking region of native genomic DNA, a promoter, an expression construct for the ScFvs DB3, a selection cassette, a termination sequence, and a 5′ flanking region of native genomic DNA. The ScFv-DB coding region (SEQ ID NO: 13) was synthesized based on the published sequence of DB3 (He et al. 1995) using the optimal codon bias for Synechocystis and incorporating an ATG start codon (instead of TGT). The coding region was inserted into the StuI restriction site of the recombinant D...

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Abstract

Expression of functionally active recombinant single chain antibodies in prokaryotic and eukaryotic heterotrophic algae for pathogen treatment or control in aquaculture and agriculture applications is disclosed; and subsequent modification of the strains to generate transgenic algae propagated under defined conditions.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This is a continuation-in-part of application Ser. No. 10 / 144,557, filed on May 13, 2002, incorporated herein by reference.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH [0002] Not applicable. REFERENCE TO A COMPACT DISK APPENDIX [0003] Not applicable. FIELD OF THE INVENTION [0004] The invention relates to the generation of recombinant genes coding for Single chain Fragment variable antibodies (ScFvs) that bind specifically to aquaculture pathogens and the expression of recombinant ScFvs genes in prokaryotic and eukaryotic photosynthetic microbes. BACKGROUND OF THE INVENTION [0005] Aquaculture is a rapidly expanding industry. The demand for aquaculture products is rising continuously because the wild population for many cultivated species are declining. Aquaculture species, such as prawn, abalone or the like, are susceptible to bacterial, viral and parasitic diseases. In dense culture situations used for aquaculture, infections often ...

Claims

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Application Information

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IPC IPC(8): A61K39/395A61K36/02C12P21/06C12N1/12A61K39/40C07H21/04C07K14/195C07K14/405C07K16/00C07K16/12C07K16/26C12N15/74C12N15/79C12N15/82C12P21/02
CPCC07K14/195C07K14/405C07K16/00C07K16/26C07K2317/13C07K2317/622C12N15/74C12N15/79C12N15/8258C12N1/12C12N1/20
Inventor WU, MADELINE CHANG SUNMAK, SALLY KA KANLAU, KEN WAN KEUNGREN, JIANPING
Owner THE HONG KONG UNIV OF SCI & TECH
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